EP0757919A1 - Procédé d'adsorption d'azote de mélanges gazeux en utilisant l'adsorption à pression alternée avec zéolites - Google Patents

Procédé d'adsorption d'azote de mélanges gazeux en utilisant l'adsorption à pression alternée avec zéolites Download PDF

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Publication number
EP0757919A1
EP0757919A1 EP96112062A EP96112062A EP0757919A1 EP 0757919 A1 EP0757919 A1 EP 0757919A1 EP 96112062 A EP96112062 A EP 96112062A EP 96112062 A EP96112062 A EP 96112062A EP 0757919 A1 EP0757919 A1 EP 0757919A1
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EP
European Patent Office
Prior art keywords
zeolite
adsorber
adsorption
air
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96112062A
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German (de)
English (en)
Inventor
Gerhard Reiss
Lothar Dr. Puppe
Bruno Hees
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Bayer AG
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Bayer AG
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Publication of EP0757919A1 publication Critical patent/EP0757919A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047—Pressure swing adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16—Alumino-silicates
    • B01J20/18—Synthetic zeolitic molecular sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B01D2253/1085—Zeolites characterized by a silicon-aluminium ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/10—Single element gases other than halogens
    • B01D2257/102—Nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/403—Further details for adsorption processes and devices using three beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/41—Further details for adsorption processes and devices using plural beds of the same adsorbent in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/047—Pressure swing adsorption
    • B01D53/0476—Vacuum pressure swing adsorption

Definitions

  • the present invention relates to an improved pressure swing adsorption process for the adsorption of nitrogen from gas mixtures with zeolite granules.
  • VSA vacuum swing adsorption
  • PSA pressure swing adsorption
  • a continuous VSA process is characterized by the following process steps: a) passing air through the zeolite bed (at, for example, 1 bar) and taking off O 2 -rich gas at the exit zone; b) evacuating the bed with a vacuum pump to a negative pressure, for example of about 100 to 400 mbar in counterflow of the air flow), c) filling the bed with O 2 -rich gas (for example to 1 bar in counterflow to the air flow (see, for example, FIG. 1) ).
  • step b) is carried out at about 1 bar with purging with part of the O 2 -rich gas.
  • PVSA so-called PVSA process
  • the separation is carried out at 1.1 to 2 bar and the desorption at approx. 200 to 500 mbar (minimum pressure).
  • the aim of these processes is a high production rate - based on the starting zeolite - and to obtain a high O 2 yield to reach (the ratio of O 2 amount in the product to O 2 amount of the flowed air).
  • a high O 2 yield includes a low energy requirement for the vacuum pump or the air compressor.
  • the economic viability of such adsorption plants is determined by the investment, e.g. Amount of adsorbent, vacuum pump size, and in particular influenced by the operating costs, such as power consumption of the vacuum pumps.
  • Zeolites have therefore been developed with which it is possible to achieve high nitrogen adsorption, so that the amount of zeolite used can be kept small or even reduced.
  • Ca zeolite A is used for this purpose.
  • Li zeolite X also has a better energy value than Na zeolite X (EP-A 461 478).
  • adsorbent beds which consist of different zones with different types of zeolite.
  • An oxygen enrichment process is known from JP 87/148 304, in which an adsorber with special arrangements of different types of zeolite is used instead of an adsorber with a zeolite bed.
  • the adsorber contains zeolites of the Na-X, Na-Y or Ca-X type on the air inlet side and zeolites of the Ca-A type on the air outlet side.
  • EP-A 0 546 542 describes a pouring arrangement in which Li zeolite X is used in the air inlet zone and Na zeolite X in the air outlet zone.
  • the task was to provide an energy-efficient pressure swing adsorption process for the adsorption of nitrogen from gas mixtures with less polar gas components, with which, compared to the prior art, improved O 2 yields can also be achieved, the production costs of oxygen with air separation reduced and the energy costs low to keep.
  • This task was surprisingly achieved with combinations of special types of zeolite in the pressure swing adsorption process.
  • the invention relates to a process for the adsorption of nitrogen from gas mixtures with less polar gas components, in particular from air, at temperatures between 20 and 50 ° C. by means of pressure swing adsorption, in which the gas mixture is passed through an adsorber which is filled with beds of zeolite granules, which is characterized in that there are at least two, preferably two, beds in the adsorber, a bed of Na zeolite X in the inlet zone of the adsorber and a bed of Li zeolite X in the outlet zone of the adsorber.
  • VSA processes in this process variant, preference is given to working at evacuation pressures between 100 and 400 mbar and adsorption pressures between 1 bar and 1.1 bar.
  • PSA processes here, preference is given to a desorption pressure of 1 to 1.1 bar and an adsorption pressure of 2 to 6 bar worked
  • PVSA here worked at an evacuation pressure between 200 and 700 mbar and an adsorption pressure between 1.1 and 2 bar.
  • the Li zeolite X used is preferably a zeolite which has a molar SiO 2 / Al 2 O 3 ratio of 2.0 to 2.5 and whose AlO 2 tetrahedral units are 80-100% associated with lithium cations .
  • the proportion of Li zeolite X in the total amount of the beds in the adsorber is preferably 20 to 80%. The proportion depends on the air inlet temperature and the pressure ratio between the maximum adsorption pressure and the minimum desorption pressure.
  • the minimum suction pressure should preferably be between 100 and 500 mbar.
  • the Na zeolite X preferably has a molar SiO 2 / Al 2 O 3 ratio of 2.0 to 3.0.
  • the gas stream can preferably be dried before passing through the zeolite bed, for example by passing through a drying layer made of silica gel.
  • the zeolite types examined were produced by ion exchange of the corresponding Na zeolite X granules.
  • Sample A Na zeolite X
  • the Na zeolite X granules were produced according to DE-A 1 203 238, Example 2, the granules thus produced containing about 18% Na zeolite A and 82% Na zeolite X.
  • the SiO 2 / Al 2 O 3 ratio was 2.3, the grain size 1-2 mm and the bulk density approx. 650 g / l.
  • Activation was carried out at 600 ° C with dry nitrogen.
  • the absorbers were provided with insulation in order to prevent heat transfer with the bypass.
  • the wall thickness of the containers was approximately 1 mm.
  • Adsorber A has ended adsorption.
  • valve 15A Only valve 15A is open on adsorber A. Only valves 12C and 13C are open on adsorber C. As a result, O 2 -rich gas flows from adsorber A via valve 15A, control valve 17ABC and valve 13C into adsorber C. In adsorber C, the evacuation step is ended, the pressure rising from the minimum level (250 mbar) to a higher level. In adsorber A the pressure drops from the maximum level (1,150 mbar) to the initial level (initial suction pressure) of 900 mbar.
  • Adsorber B starts the air separation, ie air passes through valve 11B into the adsorber B, O 2 -rich product gas leaves the adsorber via valve 14B and is discharged to the compressor G10.
  • Adsorber A is pumped out, for example, from 900 mbar via the vacuum pump V 10 to, for example, 250 mbar.
  • Adsorber B is ( "Time sec 0-6.” As described) on adsorption, the same time is filled via valve 13C O 2 -rich gas via valve 18ABC and 16ABC in adsorber C. Only valve 13C is open on adsorber C. The filling quantity is dimensioned so that at the end of this period the pressure in the adsorber C is 1,080 to 1,090 mbar.
  • adsorber C separates the air, then adsorber A, i.e. the two times "0-6 sec.” and "6-30 sec.” are repeated accordingly.
  • the following parameters are also measured during the test: the amount of product rich in O 2 , the pressure curve at the adsorption inlet during the pumping time, the amount of gas pumped out.
  • Example 1 (comparison; Na zeolite X)
  • Na zeolite X corresponding to sample A was used in the adsorber.
  • the residual H 2 O loading of the activated zeolite was below 0.5% by weight (according to DIN 8948; P 2 O 5 method).
  • the amount of zeolite per adsorber was 190 kg.
  • the oxygen enrichment was carried out according to the above statements. The following data were determined: Air temperature at inlet [° C] 40 Product quantity [Nm 3 / h] 15.9 O 2 yield [%] 45.5 Calculated total energy requirement [KWh / Nm 3 O 2 0.46
  • Example 2 (comparison; Li zeolite X)
  • Li zeolite X corresponding to sample B was used in the adsorber (190 kg / adsorber).
  • the residual H 2 O loading of the activated zeolite was below 0.5% by weight.
  • the following data were determined: Air temperature at inlet [° C] 40 Product quantity [Nm 3 / h] 23 O 2 yield [%] 54 Calculated total energy requirement [KWh / Nm 3 O 2 ] 0.375
  • Example 3 (comparison; Li zeolite X in the entry zone and Na zeolite X in the exit zone)
  • Example 4 (according to the invention; Na zeolite X in the entry zone and Li zeolite X in the exit zone)
  • Example 3 provides very poor energy values for the oxygen generated (see FIGS. 3 and 4).
  • the energy requirement is almost identical to the energy value of the pure Li-zeolite bed (example 2). Since lithium zeolite X is significantly more expensive to produce than Na zeolite X, the bed according to the invention can be used to produce oxygen at a significantly lower cost.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
EP96112062A 1995-08-08 1996-07-26 Procédé d'adsorption d'azote de mélanges gazeux en utilisant l'adsorption à pression alternée avec zéolites Withdrawn EP0757919A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19529094A DE19529094A1 (de) 1995-08-08 1995-08-08 Verfahren zur Adsorption von Stickstoff aus Gasgemischen mittels Druckwechseladsorption mit Zeolithen
DE19529094 1995-08-08

Publications (1)

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EP0757919A1 true EP0757919A1 (fr) 1997-02-12

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EP96112062A Withdrawn EP0757919A1 (fr) 1995-08-08 1996-07-26 Procédé d'adsorption d'azote de mélanges gazeux en utilisant l'adsorption à pression alternée avec zéolites

Country Status (11)

Country Link
EP (1) EP0757919A1 (fr)
JP (1) JPH0952703A (fr)
KR (1) KR970009858A (fr)
CN (1) CN1151330A (fr)
BR (1) BR9603342A (fr)
CA (1) CA2182641A1 (fr)
CZ (1) CZ234396A3 (fr)
DE (1) DE19529094A1 (fr)
HU (1) HUP9602189A2 (fr)
PL (1) PL315539A1 (fr)
TR (1) TR199600606A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1044715A1 (fr) * 1999-04-13 2000-10-18 Air Liquide Santé (International) Equipement médical de concentration/liquéfaction d'oxygène utilisable en oxygènothérapie
US6152991A (en) * 1997-04-17 2000-11-28 Praxair Technology, Inc. Multilayer adsorbent beds for PSA gas separation
EP1157731A1 (fr) * 2000-05-25 2001-11-28 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Concentrateur d'oxygène portable
EP1230967A2 (fr) * 2001-02-13 2002-08-14 Air Products And Chemicals, Inc. Production d'oxygène de haute pureté par adsorption à pression alternée
US6629525B2 (en) 2000-08-03 2003-10-07 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
US6691702B2 (en) 2000-08-03 2004-02-17 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
US20180229212A1 (en) * 2017-02-13 2018-08-16 Won Hi Tech Corp. Adsorption tower for oxygen generating system containing two kinds of adsorbing agents filled therein

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6824590B2 (en) 2000-11-07 2004-11-30 Air Products And Chemicals, Inc. Use of lithium-containing fau in air separation processes including water and/or carbon dioxide removal

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62148304A (ja) * 1985-12-23 1987-07-02 Nippon Sanso Kk 圧力変動吸着法による高濃度酸素ガス製造装置
JPS634824A (ja) * 1986-06-24 1988-01-09 Tosoh Corp 不純ガス吸着床
EP0537597A1 (fr) * 1991-10-07 1993-04-21 Praxair Technology, Inc. Procédé d'adsorption à pression alternée à basses températures avec réfrigération
EP0546542A1 (fr) * 1991-12-11 1993-06-16 Praxair Technology, Inc. Lits d'adsorbent améliores pour des procédés d'adsorption à pression alternée
US5529610A (en) * 1993-09-07 1996-06-25 Air Products And Chemicals, Inc. Multiple zeolite adsorbent layers in oxygen separation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62148304A (ja) * 1985-12-23 1987-07-02 Nippon Sanso Kk 圧力変動吸着法による高濃度酸素ガス製造装置
JPS634824A (ja) * 1986-06-24 1988-01-09 Tosoh Corp 不純ガス吸着床
EP0537597A1 (fr) * 1991-10-07 1993-04-21 Praxair Technology, Inc. Procédé d'adsorption à pression alternée à basses températures avec réfrigération
EP0546542A1 (fr) * 1991-12-11 1993-06-16 Praxair Technology, Inc. Lits d'adsorbent améliores pour des procédés d'adsorption à pression alternée
US5529610A (en) * 1993-09-07 1996-06-25 Air Products And Chemicals, Inc. Multiple zeolite adsorbent layers in oxygen separation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8732, Derwent World Patents Index; Class E36, AN 87-224219, XP002018872 *
DATABASE WPI Section Ch Week 8807, Derwent World Patents Index; Class E36, AN 88-046752, XP002018871 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6152991A (en) * 1997-04-17 2000-11-28 Praxair Technology, Inc. Multilayer adsorbent beds for PSA gas separation
EP1044715A1 (fr) * 1999-04-13 2000-10-18 Air Liquide Santé (International) Equipement médical de concentration/liquéfaction d'oxygène utilisable en oxygènothérapie
EP1044714A1 (fr) * 1999-04-13 2000-10-18 Air Liquide Sante (International) Equipement medical portable de production d'oxygène utilisable en oxygénothérapie
FR2792210A1 (fr) * 1999-04-13 2000-10-20 Air Liquide Sante Int Equipement medical portable d'oxygenotherapie a domicile
EP1157731A1 (fr) * 2000-05-25 2001-11-28 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Concentrateur d'oxygène portable
US6629525B2 (en) 2000-08-03 2003-10-07 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
US6691702B2 (en) 2000-08-03 2004-02-17 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
EP1230967A2 (fr) * 2001-02-13 2002-08-14 Air Products And Chemicals, Inc. Production d'oxygène de haute pureté par adsorption à pression alternée
EP1230967A3 (fr) * 2001-02-13 2003-01-15 Air Products And Chemicals, Inc. Production d'oxygène de haute pureté par adsorption à pression alternée
US20180229212A1 (en) * 2017-02-13 2018-08-16 Won Hi Tech Corp. Adsorption tower for oxygen generating system containing two kinds of adsorbing agents filled therein

Also Published As

Publication number Publication date
TR199600606A2 (tr) 1997-02-21
HUP9602189A2 (en) 1997-06-30
PL315539A1 (en) 1997-02-17
DE19529094A1 (de) 1997-02-13
CN1151330A (zh) 1997-06-11
KR970009858A (ko) 1997-03-27
CZ234396A3 (en) 1997-03-12
JPH0952703A (ja) 1997-02-25
HU9602189D0 (en) 1996-09-30
BR9603342A (pt) 1998-05-05
CA2182641A1 (fr) 1997-02-09

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